I can see that the fonts used for the serial numbers are different: rounded top on the "3" on the frame, receiver, take-down lever, trigger bar, safety lever, etc., versus the flat-topped "3" on the barrel, sideplate, front and rear sections of the toggle, rear sight base and slider, etc.
So it's either force matched, or an upper from an artillery Erfurt put on a lower with a matching number(?!).
Also, is it correct for the front section of the toggle, the part with the "Erfurt" stamp, to have a "37" on the SIDE versus the top?
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